Entry criteria to one phase will become exit criteria to 
other phase.
For suppose 
Entry criteria :requirements for Design phase.
 will come from First phase i.e information gathering phase.
Exit criteria :The out come from Design phase becomes Exit 
criteria and becomes entry criteria for Coding phase.

if it is wrong please correct me.

Entry criteria is nothingbut what to be needed for the 
present testing and Exit criteria nothingbut what is the 
ending of that testting

for example in system testing Entry criteria is 
successfully compleetion of integration testing
 
Exit criteria are
 
 Sign off system testing

one another example
 
for the Regression testing 
Entry criteria : Testing of change requirements are signed 
off

Exitcriteria:  All regression test cases are executed 
status Report document

Entry and exit criteria is nothing but when to start 
testing and when to stop testing.

Entry criteria:
All source codes are unit tested
All QA resource has enought functional knowledge
H/W and s/w are in place
Test plans and test cases are reviewed and signed off
Exit criteria: 
Ensuring sufficient coverage of code 
Ensuring sufficient coverage of functionality 
Testing all of the high risk areas 
The reliability of the product 
The amount and severity of acceptable faults 
The testing completeness deadline